Countersunk Serrated External Tooth Lock Washer
Heavy Hexagon Head Bolt ASTM-A325+Nut:A563+Washer:F436 (Inch)
High Tensile Structural Hexagon Head Bolts ASTM-A490
HEXAGON SOCKET COUNTERSUNK HEAD SCREWS mm., inch
Hexagon Head Bolts Grade 8.8 (High Tensile/High Tension Bolt)